Microsoft released a preview of Windows 8.1 yesterday which interested users can install on their systems. It is not really recommended to do so on productive systems, considering that you will lose access to all installed programs and apps once you make the upgrade to the final version of Windows 8.1

The new version of Windows introduces several changes and also improvements. A basic example is that apps that you install are not automatically added to the start page anymore. This may look like a small change but it means that you will have to find out how you can pin apps to the start screen, or where you find those installed apps after all.